Julianne Hough and her handsome co-star shoot steamy scenes for new movie... but what will boyfriend Ryan Seacrest say?

She might be dating American Idol host Ryan Seacrest, but her relationship must have been the last thing on Julianne Hough's mind yesterday as she frolicked with co-star Diego Boneta on the set of their new film Rock Of Ages.

The 22-year-old dancer didn't seem to have any trouble getting into character for the movie as she indulged in several passionate clinches with her dark-haired co-star as they shot scenes in Miami.

Wrapping
her legs around the muscle bound hunk, Julianne grinned at Diego, staring into his eyes before leaning in for a kiss.

What would Ryan say? Julianne Hough appeared to be unconcerned about her relationship with Seacrest as she frolicked in the surf with Rock Of Ages co-star Diego Boneta

Steamy: The couple certainly seemed to be enjoying themselves as they filmed the steamy scenes in Miami

The boyfriend: Seacrest was seen yesterday at Simon Fuller's Hollywood Walk of Fame star unveiling

And Diego also appeared to be enjoying the shoot, grabbing the tops of Julianne's thighs and holding on tight to her super fit physique.

However, it remains to be seen what Secrest, Julianne's boyfriend of over a year, makes of his girlfriend's on-screen shenanigans.

But it was reported recently that things are going so well between Secrest and Julianne that he is even thinking about asking her to marry him.

A source told Radaronline that the couple are 'so in love it’s unreal', before adding: 'I have never seen Ryan like this before.

'I’ve seen him with past girlfriends and he has never been like this with them.

'He is literally crazy for her, he absolutely dotes on her and just can’t do enough to make her happy and feel special.'

'Marriage
is definitely on the cards. We all thought he was going to propose
Valentine’s weekend, but then he didn’t... typical Ryan!

'He wants to do
things on his terms and wow everyone, he’s never one to be predictable!'

And while Julianne's personal life is
going from strength to strength, she is keen to say the same about her
career, and is working hard on new movie Rock Of Ages.

On
the shoot yesterday, Julianne showed off her gym-honed figure in an
Eighties-style purple and yellow bikini which accentuated her curves,
which she has been perfecting with intense work-outs over the last two weeks.

Cuddling up: Julianne and Diego put on some steamy clinches for the camera, with Julianne wrapping her legs tightly around Diego's waist

Up in the air: Diego effortlessly lifts up Julianne as they mess around in the warm sea

Talking recently about how she stays in shape, Julianne said her figure is down to daily workouts.

She said: 'There are certain areas of
the body that dancing won't tone, so I still stretch and do crunches,
lunges, and arm moves just about every day.

'It’s so hard to stay fit while you’re traveling, but for me it always makes me feel better on the inside if I’ve worked out.